Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of the first image of a first embodiment of a display screen or portion thereof with transitional graphical user interface showing my new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a front view of the first image of a second embodiment of a display screen or portion thereof with transitional graphical user interface showing my new design;

FIG. 6 is a second image thereof;

FIG. 7 is a third image thereof;

FIG. 8 is a fourth image thereof;

FIG. 9 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 1;

FIG. 10 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 2;

FIG. 11 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 3;

FIG. 12 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 4;

FIG. 13 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 5;

FIG. 14 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 6;

FIG. 15 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 7; and,

FIG. 16 is an enlarged view of the portion defined by dot-dash broken lines shown in FIG. 8.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-4 and between the images shown in FIGS. 5-8. The process or period in which one image transitions to another in each sequence forms no part of the claimed design.

The outermost dash-dash broken lines in the FIGS. 1-8 show a display screen or portion thereof and form no part of the claimed design. The remainder of the dash-dash broken lines of the figures show elements of the graphical user interface and form no part of the claimed design. The dot-dash broken lines defining elements of the claimed design that are illustrated in enlargements form no part of the claimed design. The elements shown in full line greyscale depict claimed subject matter. 

CLAIM I claim the ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 